// 2. 修复后的 SimpleRedisLock.java
package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock {

    private String name;
    private StringRedisTemplate stringRedisTemplate;

    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    private static final String KEY_PREFIX = "lock:";
    // 修复：移除静态UUID，改为动态生成
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT; // 修复拼写错误
    static{
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        //修复：动态生成线程标识
        String threadId = UUID.randomUUID().toString(true) + "-" + Thread.currentThread().getId();
        //获取锁
        Boolean success = stringRedisTemplate.opsForValue()
                .setIfAbsent(KEY_PREFIX + name, threadId, timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }

    @Override
    public void unlock() {
        //修复：动态生成线程标识，与加锁时一致
        String threadId = UUID.randomUUID().toString(true) + "-" + Thread.currentThread().getId();
        //调用lua脚本
        stringRedisTemplate.execute(
                UNLOCK_SCRIPT, // 修复变量名
                Collections.singletonList(KEY_PREFIX + name),
                threadId);
    }
}